Hydra code release

Hydra is an adaptive particle-particle, particle-mesh plus smoothed particle hydrodynamics code developed by; Hugh Couchman, University of Western Ontario Frazer Pearce, University of Sussex Peter Thomas, University of Sussex The code is available as a tar file from; http://coho.astro.uwo.ca/pub/hydra/hydra.html or http://star-www.maps.susx.ac.uk/~frp/hydra/hydra.html . This file also contains a README file that describes how to compile and run the code and some additional documentation